Thermodynamic properties of (an ethyl ester + a branched alkane). XV. HmE and VmE values for (an ester + an alkane) |
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| Institution: | 1. Department of Engineering Chemistry, A.U College of Engineering (A), Visakhapatnam, India;2. Advanced Analytical Laboratory, DST-PURSE Programme, Andhra University, India;3. Scientist, Natural Resources & Outreach Division, CSIR-NISCAIR, New Delhi, India;1. Department of Physics, KRK Govt. Degree College, Addanki, 523201 A.P., India;2. Department of Physics, NM Govt. Degree College, Jogipet, 502270 Telangana, India;3. Department of Physics, PBN College, Nidubrolu, 522124 A.P., India;4. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, 522510 A.P., India;1. Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, India;2. Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, India;3. Department of Biochemistry, Kurukshetra University, Kurukshetra 136119, India;1. Department of Chemistry, University of Burgos, 09001 Burgos, Spain;2. Department of Chemical Engineering, Qatar University, P.O. Box 2713, Doha, Qatar |
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| Abstract: | This paper presents HmE and VmE measurements taken at T=298.15 K and at the atmospheric pressure of 100.65 kPa for 22 binary mixtures composed of one of four ethyl esters (methanoate, ethanoate, propanoate, and pentanoate) and one of seven alkane isomers, C6 to C8. The HmE of four binary mixtures of ethyl propanoate and pentanoate with n-C6 and n-C8, measured at the conditions mentioned above are also presented. The results indicate that the mixing process is endothermic for all the mixtures, with HmE varying regularly with the components chain length, increasing with alkane chain length and decreasing with the acid chain length in the ester. The VmE values vary also regularly in a manner similar to that of the HmE slight contractions are observed for (ethyl pentanoate + 2-methylpentane).A new form of a polynomial equation used previously was employed to correlate the experimental values of the excess quantities and yielded good results in all cases. In addition, the behaviour of these mixtures is explained in terms of an interaction model proposed in previous work. |
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